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CALIBRATION PROCEDURE NI 4070/4072 6½-Digit FlexDMM This document contains step-by-step in structions for writing an ex ternal calibration procedure for the National Instruments PXI/PCI-407 0 and NI PXI-4072 digital multimet ers (DMMs). Each of these National Instruments DMMs is a 6½-digit FlexDMM and 1.
NI 4070/4072 Calibrati on Procedure 2 ni.com Conventions The following conventions ar e used in this document: » The » symbol leads you through nested menu items and dialog box opt ions to a final action.
© National Instruments Corporation 3 NI 4070/4072 Calibration Procedure The procedures in this document are described using C func tion calls. Y ou also can program in LabVIEW usin g the VIs that correspond to the C function calls.
NI 4070/4072 Calibrati on Procedure 4 ni.com Calibration Inter val The accuracy requirements of your measurement application determine how often you should calibrate th e NI 4070/40 72. NI recommends performing a complete calibrati on at l east once every two years.
© National Instruments Corporation 5 NI 4070/4072 Calibration Procedure 300 pF range, a capacitor with v alu es between 90 –100% of full scale should be used.
NI 4070/4072 Calibr ation Procedure 6 ni.com • Clean any oxidation from the banana plugs on the Fluke 5440 cables before plugging them into the binding posts of th e calibrator or the banana plug connectors o f the NI 4070 /4072.
© National Instruments Corporation 7 NI 4070/4072 Calibration Procedure Fluke 5700A/5720A user d ocumentation for instruction s on calibrating these de vices. Note Ensure that both the calibrator an d the NI 4070/ 4072 (installed in a powered-on PXI chassis or PC) are warmed up for at leas t 60 minutes before you begin this procedure.
NI 4070/4072 Calibrati on Procedure 8 ni.com V erifying DC V oltage To verify DC voltage of the NI 4070/4072, com plete the following steps: 1. Plug in the insulated banana plug shorting bar acro ss the HI and LO banana plug connectors on the NI 4070/4072.
© National Instruments Corporation 9 NI 4070/4072 Calibration Procedure 12. Set the input resistance of the NI 4070/4072 to 10 M Ω by calling niDMM_SetAttributeViReal64 with the following parameters: • Attribute_ID = NIDMM_ATTR _INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_10_MEGAOHM 13.
NI 4070/4072 Calibrati on Procedure 10 ni.com Figure 1. Cable Connections for Volt age and 2-Wire Resistance 23. W ait two minutes for th e thermal EMF to stabilize. 24. Generate 0 V on the calibrator . 25. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_DC_VOLTS • Range = 0.
© National Instruments Corporation 11 NI 4070/4072 Calibration Procedure 27. Call niDMM_ConfigureMultiPoint with the following parameters: • Trigger Count = 1 • Sample Count = 10 • Sample Trigger = NIDMM_VAL_IMMEDIATE • Sample Interval = –1 28.
NI 4070/4072 Calibrati on Procedure 12 ni.com 34. Set the input resistance of the NI 4070/4072 to >10 G Ω by calling niDMM_SetAttributeViReal64 with the following parameters: • Attribute_ID = NIDMM_ATTR _INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_GREATER_ THAN_10_GIGAOHM 35.
© National Instruments Corporation 13 NI 4070/4072 Calibration Procedure 45. Set the input resistance of the NI 4070/4072 to >10 G Ω by calling niDMM_SetAttributeViReal64 with the following parameters: • Attribute_ID = NIDMM_ATTR _INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_GREATER_ THAN_10_GIGAOHM 46.
NI 4070/4072 Calibrati on Procedure 14 ni.com 58. Set the input resistance of the NI 4070/4072 to 10 M Ω by calling niDMM_SetAttributeViReal64 with the following parameters: • Attribute_ID = NIDMM_ATTR _INPUT_RESISTANCE • Attribute_Value = NIDMM_VAL_10_MEGAOHM 59.
© National Instruments Corporation 15 NI 4070/4072 Calibration Procedure 71. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_DC_VOLTS • Range = 300 • Resolution = 300e–6 72. Call niDMM_Read . Before you apply the volta g e, the DMM must be in the 300 V range.
NI 4070/4072 Calibrati on Procedure 16 ni.com 5. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_AC_VOLTS • Range = 0.05 • Resolution = 50e–9 6. Call niDMM_Read . V erify that this meas urement falls between the limits listed in T able 16.
© National Instruments Corporation 17 NI 4070/4072 Calibration Procedure 13. Repeat step 12 for each of the re maining iterations sho wn in T able 2. 14. Output 500 mV at 30 Hz o n the calibrato r . 15. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED • Range = 0.
NI 4070/4072 Calibrati on Procedure 18 ni.com c. Call niDMM_Read . V erify that this meas urement falls between the limits listed in T able 16. d. Call niDMM_ConfigureMeasurement again, changing Mode to NIDMM_VAL_AC_VOLTS_DCCOUPLED . e. Call niDMM_Read .
© National Instruments Corporation 19 NI 4070/4072 Calibration Procedure 21. Refer to T a ble 4 for the appropriate calibrator outputs and parameter v alues as you complete the following steps: a. On the calibrator , output the value listed in the Calibrator Output column in T able 4 for the curren t iteration.
NI 4070/4072 Calibrati on Procedure 20 ni.com 23. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED • Range = 50 • Resolution = 50e–6 24. Call niDMM_Read . V erify that this measurement f alls betw een the limits listed in T able 16.
© National Instruments Corporation 21 NI 4070/4072 Calibration Procedure 26. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_AC_VOLTS_DCCOUPLED • Range = 300 • Resolution = 300e–6 27. Call niDMM_Read . The DMM must be in the 3 00 V range before you apply the voltage.
NI 4070/4072 Calibrati on Procedure 22 ni.com 31. Reset the calibrator for safety reasons. Y ou have completed v erifying the A C voltage of the NI 4070/40 72. Select one of the following options: • If you want to continue verifying o ther modes, go to the Verifying 4-Wire Resistance section.
© National Instruments Corporation 23 NI 4070/4072 Calibration Procedure 3. W ait two minutes for th e thermal EMF to stabilize if the Fluke 5440 cables were not previously connected in this configuration.
NI 4070/4072 Calibrati on Procedure 24 ni.com 6. Repeat step 5 for each of the rema ining iterations listed in T able 8. Y ou hav e completed verifying the 4-wire resistance of the NI 4070/4072. Select one of the follo wing options: • If you want to continue verifying o ther modes, go to the Verifying 2-Wire Resistance section.
© National Instruments Corporation 25 NI 4070/4072 Calibration Procedure 4. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_2_WIRE_RES • Range = 10e3 • Resolution = 0.01 5. Call niDMM_ConfigureOffsetCompOhms with OffsetCompOhms set to NIDMM_VAL_OFFSET_COMP_OHMS_ON .
NI 4070/4072 Calibrati on Procedure 26 ni.com 19. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_2_WIRE_RES • Range = 100e6 • Resolution = 100 20. Call niDMM_Read and store the result as the 100 M Ω range of fset.
© National Instruments Corporation 27 NI 4070/4072 Calibration Procedure 28. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_2_WIRE_RES • Range = 10e3 • Resolution = 0.
NI 4070/4072 Calibrati on Procedure 28 ni.com 35. Call niDMM_ConfigureMultiPoint with the following parameters: • Trigger Count = 1 • Sample Count = 10 • Sample Trigger = NIDMM_VAL_IMMEDIATE • Sample Interval = –1 36.
© National Instruments Corporation 29 NI 4070/4072 Calibration Procedure 45. Call niDMM_Read . Subtract the pre viously stored 1 M Ω range offset from this measurement. V erify that the result falls between the tolerances listed in T able 18. 46. Output 100 k Ω on the calibrator without external sense or 2-wire compensation.
NI 4070/4072 Calibrati on Procedure 30 ni.com 57. Call niDMM_Read . Subtract the pre viously calculated 100 Ω range of fset from this measur ement. V erify that the result falls between the tolerances listed in T able 18. Y ou hav e completed verifying the 2-wire resistance of the NI 4070/4072.
© National Instruments Corporation 31 NI 4070/4072 Calibration Procedure 3. Call niDMM_reset to reset the NI 4070/4072 to a known state. 4. Set the current output on the calibrato r to NORM and output 0 A. 5. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_DC_CURRENT • Range = 0.
NI 4070/4072 Calibrati on Procedure 32 ni.com 13. Output 20 mA on the calibrator . 14. Call niDMM_Read . V erify that this measurement f alls betw een the limits listed in T able 19. 15. Output –20 mA on the calib rator . 16. Call niDMM_Read . V erify that this measurement f alls betw een the limits listed in T able 19.
© National Instruments Corporation 33 NI 4070/4072 Calibration Procedure V erifying AC Current To verify the AC current of the NI 407 0/4072, complete the followin g steps: 1.
NI 4070/4072 Calibrati on Procedure 34 ni.com 14. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_AC_CURRENT • Range = 1 • Resolution = 1e–6 15. Call niDMM_Read . V erify that this measurement f alls betw een the limits listed in T able 20.
© National Instruments Corporation 35 NI 4070/4072 Calibration Procedure T o verify the frequency of the NI 4070/4072, comple te the following steps: 1. Remov e all connections from the NI 4070/40 72. Note Polarity is not importan t in steps 2, 3, and 5.
NI 4070/4072 Calibrati on Procedure 36 ni.com 12. Call GPCTR_Change_Parameter with the following parameters: • deviceNumber = the device number of the NI 6608, as signed by MAX • gpctrNum = ND_COUNTER_0 • paramID = ND_COUNT_2 • paramValue = 10e6 13.
© National Instruments Corporation 37 NI 4070/4072 Calibration Procedure V erifying Capacitance and Inductance (NI 4072 Only) This verification procedure only appl ies to the NI 4072 and requires additional test equi pment, as indicated i n the Additional Requirements for the NI 4072 section.
NI 4070/4072 Calibrati on Procedure 38 ni.com To verify the capacitance measuremen ts of the NI 4072, complete the following steps: 1. Disconnect any f ixt ures or cables from the NI 4072. 2. Call niDMM_reset to reset the NI 4070/4072 to a known state.
© National Instruments Corporation 39 NI 4070/4072 Calibration Procedure 11. Call niDMM_ConfigureMeasurement with t he follo wing parameters: • Function = NIDMM_VAL_CAPACITANCE • Range = 300e-12 • Resolution = 50e-15 12.
NI 4070/4072 Calibrati on Procedure 40 ni.com 19. Set the number of av erages of the NI 4072 to 20 by calling niDMM_SetAttributeViInt32 with the following parameters: • Attribute_ID = NIDMM_A TTR_LC.
© National Instruments Corporation 41 NI 4070/4072 Calibration Procedure Adjustment Procedures This section explains how to adjust the NI 4070/ 4072. You can choose to perform these adjustment procedures with or without perfo rming the verification procedures first.
NI 4070/4072 Calibrati on Procedure 42 ni.com Adjusting DC V oltage and Resistance To adjust the DC voltage and resistance of the NI 4070/4072, complete the following steps: 1.
© National Instruments Corporation 43 NI 4070/4072 Calibration Procedure 10. Call niDMM_CalAdjustGain with the following parameters: • Mode = NIDMM_VAL_DC_VOLTS • Range = 10 • Input Resistance = NIDMM_VAL_GREATER_THAN_1 0_GIGAOHM • Expected Measurement = 10 11.
NI 4070/4072 Calibrati on Procedure 44 ni.com 23. Output 0 Ω from the calibrator without external sense or 2-wire compensation. 24. Call niDMM_CalAdjustGain with the following parameters: • Mode = NIDMM_VAL_2_WIRE_RES • Range = 10e6 • Input Resistance = NIDMM_VAL_RESISTANCE_NA • Expected Value = the display on the calibrator for 0 Ω 25.
© National Instruments Corporation 45 NI 4070/4072 Calibration Procedure 36. Call niDMM_CalAdjustGain with the following parameters: • Mode = NIDMM_VAL_2_WIRE_RES • Range = 100e6 • Input Resistance = NIDMM_VAL_RESISTANCE_NA • Expected Value = the display on the calibrator for 0 Ω 37.
NI 4070/4072 Calibrati on Procedure 46 ni.com 46. Call niDMM_CalAdjustOffset with the following parameters: • Mode = NIDMM_VAL_4_WIRE_RES • Range = 10e3 • Input Resistance = NIDMM_VAL_RESISTANCE_NA 47. Call niDMM_CalAdjustMisc with Type set to NIDMM_EXTCAL_MISCAL_RREF .
© National Instruments Corporation 47 NI 4070/4072 Calibration Procedure 58. Call niDMM_CalAdjustOffset with the following parameters: • Mode = NIDMM_VAL_2_WIRE_RES • Range = 1e6 • Input Resistance = NIDMM_VAL_RESISTANCE_NA 59.
NI 4070/4072 Calibrati on Procedure 48 ni.com • If you are not performing addi tional adjustments, refer to on e of the following sections: – Verification Procedures — to verify your new calibra.
© National Instruments Corporation 49 NI 4070/4072 Calibration Procedure 5. Refer to T able 12 for the appropriate parameter values as you complete the following steps: a.
NI 4070/4072 Calibrati on Procedure 50 ni.com 7. Refer to T able 13 for the appropria te calibrator outputs and parameter v alues as you complete the following steps: a. On the calibrator , output the value listed in the Calibrator Output column in T abl e 13 for t he current iteratio n.
© National Instruments Corporation 51 NI 4070/4072 Calibration Procedure 10 500 mV 5 NIDMM_VAL_AC_VOLTS 0.5 5e3 500 mV 5 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 5e3 11 500 mV 20 NIDMM_VAL_AC_VOLTS 0.5 20e3 500 mV 20 NIDMM_VAL_AC_VOLTS_DCCOUPLED 0.5 20e3 12 500 mV 50 NIDMM_VAL_AC_VOLTS 0.
NI 4070/4072 Calibrati on Procedure 52 ni.com 24 5 V 500 NIDMM_VAL_AC_VOLTS 5 500e3 5 V 500 NIDMM_VAL_AC_VOLTS_DCCOUPLED 5 500e3 25 50 V 1 NIDMM_VAL_AC_VOLTS 50 1e3 50 V 1 NIDMM_VAL_AC_VOLTS_DCCOUPLED.
© National Instruments Corporation 53 NI 4070/4072 Calibration Procedure 9. Reset the calibrator for safety reaso ns. 10. Call niDMM_CalAdjustMisc with Type set to NIDMM_EXTCAL_MISCCAL_SECTION . Y ou hav e completed adjusting the AC voltage modes of the NI 40 70/4072.
NI 4070/4072 Calibrati on Procedure 54 ni.com • If you skip this section and you want to verify the new calibration coef ficients before sa ving th em to the EEPR O M, repeat the Verification Procedures sectio n (except for Initial Setup ).
© National Instruments Corporation 55 NI 4070/4072 Calibration Procedure 11. Call niDMM_CalAdjustOffset with the following parameters: • Mode = NIDMM_VAL_AC_CURRENT • Range = 0.01 • Input Resistance = NIDMM_VAL_RESISTANCE_NA 12. Output 200 mA on the calib rator .
NI 4070/4072 Calibrati on Procedure 56 ni.com 22. Call niDMM_CalAdjustGain with the following parameters: • Mode = NIDMM_VAL_DC_CURRENT • Range = 1 • Input Resistance = NIDMM_VAL_RESISTANCE_NA • Expected Value = – 1 23. Output 0 A on the calibrator with the current ou tput set to NORM .
© National Instruments Corporation 57 NI 4070/4072 Calibration Procedure ♦ If you are calibrating an NI 4072, you must complete this section to attain a valid calibration. Caution It is necessary to adjust DC v oltag e and resistance before running these adjustment steps.
NI 4070/4072 Calibrati on Procedure 58 ni.com • T o finish the calibration and close the session, go to the Completing th e Adjustment Procedures section.
© National Instruments Corporation 59 NI 4070/4072 Calibration Procedure AC Voltage –100 mV 100 mV >10 G Ω / 10 M Ω – 0.100006 V – 0.0999 94 V – 0.100002 V – 0.09 9998 V 1V 1V >10 G Ω / 10 M Ω 0 .999969 V 1.000031 V 0.999992 V 1.000008 V –1 V 1V >10 G Ω / 10 M Ω –1.
NI 4070/4072 Calibrati on Procedure 60 ni.com 500 mV 100 kHz 500 mV AC /D C 0.4974 V 0.50 26 V 500 mV 300 kHz 500 mV AC /D C 0.48 475 V 0.51525 V 5V 30 Hz 5V DC 4.9945 V 5.0055 V 5V 50 Hz 5V AC / D C 4.9965 V 5.0035 V 5V 1k H z 5V AC / D C 4.9965 V 5.
© National Instruments Corporation 61 NI 4070/4072 Calibration Procedure 4-Wire Resistance Note T olerances are provided for 4-wire resistan ce instead of absolute limits because the limits depend on the actual resistan ce v alue output by your calibrator .
NI 4070/4072 Calibrati on Procedure 62 ni.com DC Current AC Current 100 k Ω 100 k Ω ±86 ppm ±17 ppm 10 k Ω 10 k Ω ±83 ppm ±14 ppm 1k Ω 1k Ω ±83 ppm ±14 ppm 100 Ω 100 Ω ±90 ppm ±25 ppm Table 19. NI 4070/4072 DC Current Verification Limits Calibrator Amplitude Range 2-Y ear Limits Lower Upper 0A 20 mA –1.
© National Instruments Corporation 63 NI 4070/4072 Calibration Procedure Frequency Capacitance and Inductance Note Because the actual capacitance verif ication values can dif fer from the following v alues, T able 22 provides tolerances th at correspond to the NI 4072 accuracy specifications Table 21.
NI 4070/4072 Calibrati on Procedure 64 ni.com Appendix A: Calibration Options The complete calibration process for the NI 4070/40 72 consists of verifying, adjusting, and reverifying a de vice.
© National Instruments Corporation 65 NI 4070/4072 Calibration Procedure Table 23. Summary of Adjustment Options Adjustment Opt ional Required DC V oltage — Y Resistance — Y A C V oltage Y — AC.
NI 4070/4072 Calibrati on Procedure 66 ni.com Figure 4. V erification Procedures Flowchart V er ify C a p a cit a nce a nd Ind u ct a nce (NI 4072 Only)? V er ify DC V olt a ge Mode? V er ify AC V olt.
© National Instruments Corporation 67 NI 4070/4072 Calibration Procedure Figure 5. Adjustment Procedures Flowchart Ye s Go to V er ification Procedures Flowchart V er ification Go to Adjusting DC V o.
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